The Search for Supernova Grains in an Ice Core

Details The Search for Supernova Grains in an Ice Core The Search for Supernova Grains in an Ice Core

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...652.1763c&link_type=abstract

The Astrophysical Journal, Volume 652, Issue 2, pp. 1763-1767.

Astronomy and Astrophysics

Astronomy

1

Ism: Dust, Extinction, Stars: Supernovae: General

Scientific paper

A search was conducted for grains of the potential core-collapse supernova (SN) condensate minerals corundum (Al2O3), hibonite (CaAl12O19), and spinel (MgAl2O4) among grains filtered from the 308.6 m Guliya ice core recovered from the Qinghai-Tibetan plateau in China. Simple models are developed and calculations are presented to estimate the number of Al2O3 grains that would be deposited per cm2 on the Earth by a nearby core-collapse SN and to estimate the number of presolar oxide grains that could be contained in micrometeorite (MM) grains that are accreted by the Earth. A total of 698 candidate SN condensate grains were identified in six Guliya ice core grain samples from the following time periods: ~2-10, ~25-27, ~34-36, ~53-57, ~59-62, and ~68-72 kyr. A procedure developed at the University of Chicago to identify presolar grains in meteoric samples was used to find these candidate grains. Nanometer-scale secondary ion mass spectrometry (NanoSIMS) analysis, performed at Washington University on 37 grains from the ~34-36, ~53-57, and ~59-62 kyr samples, indicated that none possessed the extreme oxygen-16 enhancements expected from a SN source. However, nine of the 37 grains did possess the oxygen-16 enhancements consistent with calcium-aluminum-rich inclusions (CAIs).

Affiliated with

Also associated with

No associations

Rating

The Search for Supernova Grains in an Ice Core does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Search for Supernova Grains in an Ice Core, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Search for Supernova Grains in an Ice Core will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1239384